Granted Patent
Utility
US 4,648,134 · App. 06/652,737
Optical receivers
Inventor:
William J. Stewart
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Sep 21, 1984
Inventor
William J. Stewart
Assignee (at issue)
Plessey Overseas Limited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.